Nb-Si金属间化合物基超高温合金研究进展-中国材料进展

文章信息/Info

Author(s):: JIA Lina; WENG Junfei; SHA Jiangbo; ZHOU Chungen; ZHANG Hu; School of Materials Science and Engineering, Beihang University

摘要:: Nb-Si金属间化合物基超高温合金具有熔点高、密度低、高温强度和加工性能良好的优点，被认为是最有希望取代第三代Ni基单晶高温合金的候选材料。本文介绍了Nb-Si金属间化合物基超高温合金的典型组织特征、合金成分优化、组织控制以及组成相的作用等方面的研究进展。目前，室温韧性、高温强度和高温抗氧化性能等单项指标基本达到应用要求，但综合性能指标距航空发动机热端部件的应用要求还有较大差距。未来，在合金优化设计的基础上，如何寻求更合适的组织控制途径，实现室温韧性、高温强度和高温抗氧化性能的综合匹配，是Nb-Si金属间化合物基超高温合金发展的重要研究方向。

Abstract:: With high melting point, low density, and good high-temperature strength and processability, ultra high temperature Nb-Si intermetallic based superalloys are considered as the most promising materials for replacing the third generation of monocrystal Ni-based superalloys. This paper introduced a series of results regarding typical microstructure characteristics, alloys’ compositions optimization, microstructural control, and roles of constituent phases for Nb-Si based superalloys. Recently, some property, such as room-temperature fracture toughness, high-temperature strength, and oxidation resistance, has met the application requirements of turbine airfoil materials. However, there is still a gap between the current comprehensive properties and application requirements. In the future, based on the optimization of alloy design, how to develop a more available process for microstructural control to achieve a comprehensive combination of room-temperature fracture toughness, high-temperature strength, and oxidation resistance, is important for the development of ultra high temperature Nb-Si intermetallic based superalloys.